You searched for subject:(Numerical Simulation).
Showing records 1 – 30 of
2135 total matches.
◁ [1] [2] [3] [4] [5] … [72] ▶
University of Toronto
1.
Bejatovic, Sintia.
Evaluation of Discrete Explicit Filtering for an Approximate Deconvolution Approach to LES.
Degree: 2011, University of Toronto
URL: http://hdl.handle.net/1807/27324 
► In the study of computational turbulence, the success of Large Eddy Simulation (LES) is largely determined by the quality of the sub-filter scale (SFS) model…
(more)
▼ In the study of computational turbulence, the success of Large Eddy Simulation (LES) is largely determined by the quality of the sub-filter scale (SFS) model and the properties of the filter used to introduce resolved and unresolved length scales. Explicit filters are desirable so that better control over the filter may be achieved, and filter operator errors can be then controlled to a desired order of accuracy. One large advantage to using an explicit filter is that the mathematical definition of the filter may be exploited when considering various SFS models or even different LES techniques. Approximate deconvolution is a technique used in LES, which performs an inverse filtering operation to partly restore the original unfiltered solution. The discrete explicit filtering technique will be used to perform the deconvolution, and numerical results will show how the approximate solution may be used to perform LES.
MAST
Advisors/Committee Members: Groth, Clinton P. T., Aerospace Science and Engineering.
Subjects/Keywords: Fluid Dynamics; Numerical Simulation; 0538
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bejatovic, S. (2011). Evaluation of Discrete Explicit Filtering for an Approximate Deconvolution Approach to LES. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/27324
Chicago Manual of Style (16th Edition):
Bejatovic, Sintia. “Evaluation of Discrete Explicit Filtering for an Approximate Deconvolution Approach to LES.” 2011. Masters Thesis, University of Toronto. Accessed January 27, 2021.
http://hdl.handle.net/1807/27324.
MLA Handbook (7th Edition):
Bejatovic, Sintia. “Evaluation of Discrete Explicit Filtering for an Approximate Deconvolution Approach to LES.” 2011. Web. 27 Jan 2021.
Vancouver:
Bejatovic S. Evaluation of Discrete Explicit Filtering for an Approximate Deconvolution Approach to LES. [Internet] [Masters thesis]. University of Toronto; 2011. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1807/27324.
Council of Science Editors:
Bejatovic S. Evaluation of Discrete Explicit Filtering for an Approximate Deconvolution Approach to LES. [Masters Thesis]. University of Toronto; 2011. Available from: http://hdl.handle.net/1807/27324
Delft University of Technology
2.
Agrawal, Abhishek (author).
Orbital motion of regolith around asteroids.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:0933c1e6-89ee-476c-9b45-3e6d235ddac6
► We study the orbital motion of regolith around asteroids, lofted from the surface due to impact cratering events, to understand the displacement of material on…
(more)
▼ We study the orbital motion of regolith around asteroids, lofted from the surface due to impact cratering events, to understand the displacement of material on the surface and in orbit. The cratering events could be natural such as from meteoroid impacts, or they can be induced from spacecraft activities such as in-situ sample collection. Understanding the dynamics of orbiting regolith is important for future science missions and commercial activities on asteroids. Knowledge about expected particulate environment due to impact ejecta can help mission designers in trajectory planning to avoid interference or damage from orbiting regolith with a spacecraft and/or its instruments. The same study could be exploited in the field of commercial in-situ asteroid mining for sorting material of different sizes and densities by artificially lofting them into an orbit...
Advisors/Committee Members: Noomen, Ron (mentor), Visser, Pieter (graduation committee), Cervone, Angelo (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Astrodynamics; Regolith; Asteroids; Numerical Simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Agrawal, A. (. (2018). Orbital motion of regolith around asteroids. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0933c1e6-89ee-476c-9b45-3e6d235ddac6
Chicago Manual of Style (16th Edition):
Agrawal, Abhishek (author). “Orbital motion of regolith around asteroids.” 2018. Masters Thesis, Delft University of Technology. Accessed January 27, 2021.
http://resolver.tudelft.nl/uuid:0933c1e6-89ee-476c-9b45-3e6d235ddac6.
MLA Handbook (7th Edition):
Agrawal, Abhishek (author). “Orbital motion of regolith around asteroids.” 2018. Web. 27 Jan 2021.
Vancouver:
Agrawal A(. Orbital motion of regolith around asteroids. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 27].
Available from: http://resolver.tudelft.nl/uuid:0933c1e6-89ee-476c-9b45-3e6d235ddac6.
Council of Science Editors:
Agrawal A(. Orbital motion of regolith around asteroids. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:0933c1e6-89ee-476c-9b45-3e6d235ddac6
University of Minnesota
3.
Tan, Winson.
Heat-transfer-based Biomedical Devices: Synergistic Numerical Simulations and Experimentation.
Degree: PhD, Mechanical Engineering, 2015, University of Minnesota
URL: http://hdl.handle.net/11299/178966
► A synergistic multi-faceted investigation was performed to demonstrate an approach to the design of thermal-based medical devices. The synergism was achieved by the mutual interaction…
(more)
▼ A synergistic multi-faceted investigation was performed to demonstrate an approach to the design of thermal-based medical devices. The synergism was achieved by the mutual interaction of numerical simulation and experimentation. Focus was directed to two independent but related biomedical devices. One of these is a non-invasive means of measuring the body core temperature under both steady state and transient circumstances. A realistic application of such a probe is the monitoring of the temperature of a patient undergoing surgery. The investigation of the novel temperature probe involved the interaction of a model of the relevant physical phenomena, which was implemented by numerical simulation. A near-congruent experimental apparatus was designed and fabricated with the view to validate the numerical results. The excellent agreement between these two independent methodologies lends strong support to the validity of the model and the utility of the results obtained. The other thermal-based device is therapeutic in that it is used to supply infusants into the human body under critical conditions. The infusants may be blood, saline, or a mixture of the two. Critical conditions demand high rates of infusion. Furthermore, the temperature of the infusants must be above a critical value to avoid the onset of hypothermia. The goal was to maximize the temperature of the delivered infusant while at the same time avoiding catastrophic events such as hemolysis which is a thermal-based necrosis of the red cells. The mutual supportive outcomes of the simulations and experiments provided strong evidence of the validity of the modeling and its numerical implementation.
Subjects/Keywords: biomedical devices; numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tan, W. (2015). Heat-transfer-based Biomedical Devices: Synergistic Numerical Simulations and Experimentation. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/178966
Chicago Manual of Style (16th Edition):
Tan, Winson. “Heat-transfer-based Biomedical Devices: Synergistic Numerical Simulations and Experimentation.” 2015. Doctoral Dissertation, University of Minnesota. Accessed January 27, 2021.
http://hdl.handle.net/11299/178966.
MLA Handbook (7th Edition):
Tan, Winson. “Heat-transfer-based Biomedical Devices: Synergistic Numerical Simulations and Experimentation.” 2015. Web. 27 Jan 2021.
Vancouver:
Tan W. Heat-transfer-based Biomedical Devices: Synergistic Numerical Simulations and Experimentation. [Internet] [Doctoral dissertation]. University of Minnesota; 2015. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/11299/178966.
Council of Science Editors:
Tan W. Heat-transfer-based Biomedical Devices: Synergistic Numerical Simulations and Experimentation. [Doctoral Dissertation]. University of Minnesota; 2015. Available from: http://hdl.handle.net/11299/178966
4.
Dougherty, Edward T.
Computation and Numerics in Neurostimulation.
Degree: PhD, Genetics, Bioinformatics, and Computational Biology, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/73350
► Neurostimulation continues to demonstrate tremendous success as an intervention for neurodegenerative diseases, including Parkinson's disease, in addition to a range of other neurological and psychiatric…
(more)
▼ Neurostimulation continues to demonstrate tremendous success as an intervention for neurodegenerative diseases, including Parkinson's disease, in addition to a range of other neurological and psychiatric disorders. In an effort to enhance the medical efficacy and comprehension of this form of brain therapy, modeling and computational
simulation are regarded as valuable tools that enable in silico experiments for a range of neurostimulation research endeavours. To fully realize the capacities of neurostimulation simulations, several areas within computation and numerics need to be considered and addressed. Specifically, simulations of neurostimulation that incorporate (i) computational efficiency, (ii) application versatility, and (iii) characterizations of cellular-level electrophysiology would be highly propitious in supporting advancements in this medical treatment.
The focus of this dissertation is on these specific areas. First, preconditioners and iterative methods for solving the linear system of equations resulting from finite element discretizations of partial differential equation based transcranial electrical stimulation models are compared. Second, a software framework designed to efficiently support the range of clinical, biomedical, and
numerical simulations utilized within the neurostimulation community is presented. Third, a multiscale model that couples transcranial direct current stimulation administrations to neuronal transmembrane voltage depolarization is presented. Fourth,
numerical solvers for solving ordinary differential equation based ligand-gated neurotransmitter receptor models are analyzed.
A fundamental objective of this research has been to accurately emulate the unique medical characteristics of neurostimulation treatments, with minimal simplification, thereby providing optimal utility to the scientific research and medical communities. To accomplish this,
numerical simulations incorporate high-resolution, MRI-derived three-dimensional head models, real-world electrode configurations and stimulation parameters, physiologically-based inhomogeneous and anisotropic tissue conductivities, and mathematical models accepted by the brain modeling community. It is my hope that this work facilitates advancements in neurostimulation
simulation capabilities, and ultimately helps improve the understanding and treatment of brain disease.
Advisors/Committee Members: Turner, James C. (committeechair), O'Hara, Kathleen Marie (committee member), Senger, Ryan S. (committee member), Bevan, David R. (committee member).
Subjects/Keywords: Simulation; Neurostimulation; Numerical Methods
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dougherty, E. T. (2015). Computation and Numerics in Neurostimulation. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73350
Chicago Manual of Style (16th Edition):
Dougherty, Edward T. “Computation and Numerics in Neurostimulation.” 2015. Doctoral Dissertation, Virginia Tech. Accessed January 27, 2021.
http://hdl.handle.net/10919/73350.
MLA Handbook (7th Edition):
Dougherty, Edward T. “Computation and Numerics in Neurostimulation.” 2015. Web. 27 Jan 2021.
Vancouver:
Dougherty ET. Computation and Numerics in Neurostimulation. [Internet] [Doctoral dissertation]. Virginia Tech; 2015. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/10919/73350.
Council of Science Editors:
Dougherty ET. Computation and Numerics in Neurostimulation. [Doctoral Dissertation]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/73350
University of New South Wales
5.
Li, Zhaoyang.
Numerical study of geometrical effects on blast furnace (BF) flow and performance.
Degree: Materials Science & Engineering, 2012, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/52525
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11198/SOURCE1?view=true
► Blast furnace (BF) geometry is of significant importance to BF process because it can affect in-furnace multiphase flows, BF stability and efficiency. In the past…
(more)
▼ Blast furnace (BF) geometry is of significant importance to BF process because it can affect in-furnace multiphase flows, BF stability and efficiency. In the past several decades, the BFs have been frequently enlarged during their relining or rebuilding. However, thus far, the effects of BF geometrical parameters are largely known empirically and the underlying reasons for the enlargement of BF are still not obvious.This thesis presents a numerical study of BF geometrical parameters by means of the BF process model. This model is based on the one recently developed by Dong et al. [1]. The previous model has been improved in terms of the following two aspects: (i), the raw material, operational and geometrical conditions are allowed to vary in a flexible range rather than fixed; and (ii), the variation of the stock line with BF inner state as encountered in practice is considered by controlling burden charge rate according to the global coke balance inside the considered BF.Firstly, the applicability of the improved model has been examined by comparing the predicted BF performances with those practically observed for BFs operated with different coke ratios and blast rates. The model was then used to study the effects of BF geometrical parameters on BF performances and inner states. The calculated results reveal that the enlargement of BF inner volume by mean of expanding any of the BF dimensions improves BF efficiency in terms of the achievable coke ratio. The expansion of BF lateral dimensions lowers the in-furnace pressure drop while the elongation of BF height tends to increase the packed bed resistance to gas flow against the BF operational stability and larger productivity. Certain ratios of the horizontal dimensions are desirable to maintain a well-controlled gas throughflow and smooth descent of burden materials. Therefore, the adjustments of the BF inner liners corresponding to the enlargement of BF inner volume have been proven to be reasonable and necessary.
Subjects/Keywords: Geometry; Blast furnace; Numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, Z. (2012). Numerical study of geometrical effects on blast furnace (BF) flow and performance. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/52525 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11198/SOURCE1?view=true
Chicago Manual of Style (16th Edition):
Li, Zhaoyang. “Numerical study of geometrical effects on blast furnace (BF) flow and performance.” 2012. Masters Thesis, University of New South Wales. Accessed January 27, 2021.
http://handle.unsw.edu.au/1959.4/52525 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11198/SOURCE1?view=true.
MLA Handbook (7th Edition):
Li, Zhaoyang. “Numerical study of geometrical effects on blast furnace (BF) flow and performance.” 2012. Web. 27 Jan 2021.
Vancouver:
Li Z. Numerical study of geometrical effects on blast furnace (BF) flow and performance. [Internet] [Masters thesis]. University of New South Wales; 2012. [cited 2021 Jan 27].
Available from: http://handle.unsw.edu.au/1959.4/52525 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11198/SOURCE1?view=true.
Council of Science Editors:
Li Z. Numerical study of geometrical effects on blast furnace (BF) flow and performance. [Masters Thesis]. University of New South Wales; 2012. Available from: http://handle.unsw.edu.au/1959.4/52525 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11198/SOURCE1?view=true
University of Toronto
6.
Wang, Yu.
Numerical Simulation of Complex Hydraulic Fracture Development by Coupling Geo-mechanical and Reservoir Simulator.
Degree: 2020, University of Toronto
URL: http://hdl.handle.net/1807/103608
► Hydraulic fracturing is one of the standard techniques adopted by oil and gas industries to enhance production in unconditional reservoirs. Reservoir properties and treatment designs…
(more)
▼ Hydraulic fracturing is one of the standard techniques adopted by oil and gas industries to enhance production in unconditional reservoirs. Reservoir properties and treatment designs have a significant influence on the effectiveness of hydraulic fracturing treatments. Extensive studies on the mechanism of hydraulic fracturing have been conducted to optimize the hydraulic fracturing design. Recent advances in fracture diagnostic technology have brought new insights to the complex fracture geometry. Numerical simulation is an economical approach to investigate the generation of fracture geometry and its effect on post-treatment production enhancement. This work proposes a workflow to study the fracture complexity through coupling the geomechanical simulator Irazu and the reservoir simulator CMG. The geo-mechanical simulator is devised to simulate the hydraulic fracturing process employing the hybrid finite-discrete element method while the reservoir simulator CMG is used for the reservoir post-treatment production forecast.
M.A.S.
Advisors/Committee Members: Grasselli, Giovanni, Civil Engineering.
Subjects/Keywords: hydraulic fracturing; numerical simulation; reservoir simulation; 0543
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, Y. (2020). Numerical Simulation of Complex Hydraulic Fracture Development by Coupling Geo-mechanical and Reservoir Simulator. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/103608
Chicago Manual of Style (16th Edition):
Wang, Yu. “Numerical Simulation of Complex Hydraulic Fracture Development by Coupling Geo-mechanical and Reservoir Simulator.” 2020. Masters Thesis, University of Toronto. Accessed January 27, 2021.
http://hdl.handle.net/1807/103608.
MLA Handbook (7th Edition):
Wang, Yu. “Numerical Simulation of Complex Hydraulic Fracture Development by Coupling Geo-mechanical and Reservoir Simulator.” 2020. Web. 27 Jan 2021.
Vancouver:
Wang Y. Numerical Simulation of Complex Hydraulic Fracture Development by Coupling Geo-mechanical and Reservoir Simulator. [Internet] [Masters thesis]. University of Toronto; 2020. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1807/103608.
Council of Science Editors:
Wang Y. Numerical Simulation of Complex Hydraulic Fracture Development by Coupling Geo-mechanical and Reservoir Simulator. [Masters Thesis]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/103608
7.
Graham, Jason Scott.
Turbulence simulations: multiscale modeling and data-intensive computing methodologies.
Degree: 2014, Johns Hopkins University
URL: http://jhir.library.jhu.edu/handle/1774.2/37045
► In this two part work, methodologies for the multiscale modeling of complex turbulent flows and data-intensive computing strategies for large-scale turbulent simulations are developed and…
(more)
▼ In this two part work, methodologies for the multiscale modeling of complex turbulent flows and data-intensive computing strategies for large-scale turbulent simulations are developed and presented. The first part of this thesis is devoted to the
simulation of turbulent flows over objects characterized by hierarchies of length-scale. Flows of this type present special challenges associated with the cost of resolving small-scale geometric elements. During large eddy
simulation (LES), their effects on the resolved scales must be captured realistically through subgrid-scale models. Prior work performed by Chester et al., J. Comput. Phys. 2007 proposed a technique called renormalized
numerical simulation (RNS), which is applicable to objects that display scale-invariant geometric (fractal) properties. The idea of RNS is similar to that of the dynamic model used in LES to determine model parameters for the subgrid-stress tensor model in the bulk of the flow. In RNS, drag
forces from the resolved elements that are obtained during the
simulation are re-scaled appropriately by determining drag coefficients that are then applied to specify the drag forces associated with the subgrid-scale elements. In the current work we introduce a generalized framework for describing and implementing the RNS methodology thereby extending the methodology first presented by Chester et al., 2007. Furthermore, we present various other possible practical implementations of RNS that differ on important, technical aspects related to 1) time averaging, 2) spatial localization, and 3)
numerical representation of the drag forces. The new RNS framework is then applied to fractal tree canopies consisting of fractal-like trees with both planar cross-section and three dimensional orientations. The results indicate that the propsed time averaged, local, and explicit formulation of RNS is superior to the predecessor formulation as it enables the modeling of spatially non-homogenous
geometries without using a low-level branch based description and preserves the assumed dynamic similary through temporal filtering. In addition, the overall predicted drag force of the non-planar fractal trees is shown to agree well with experimental data. In addition to RNS, a methodology for generating accurate inflow conditions in multiscale turbulence simulations is present. This technique called concurrent precursor
simulation (CPS) allows the synchronous generation of inflow data from an upstream precursor
simulation. This approach conceptually is the same as the standard precursor simulations (Lund et al., J. Comput. Phys. 1998 and Ferrante et al., J. Comput. Phys. 2004) used in the past, however, it eliminates the I/O bottleneck of disk reads and writes by transferring sampled data directly between domains using MPI. Furthermore, issues with recycling time scales of the sample inflow library are removed since the upstream, precursor
simulation is performed concurrently with
the target
simulation. This methodology is applied to a single fractal tree (modeled using RNS)…
Advisors/Committee Members: Meneveau, Charles (advisor).
Subjects/Keywords: turbulence;
numerical simulation;
large eddy simulation;
direct numerical simulation;
subgrid-scale modeling;
data-intensive computing
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Graham, J. S. (2014). Turbulence simulations: multiscale modeling and data-intensive computing methodologies. (Thesis). Johns Hopkins University. Retrieved from http://jhir.library.jhu.edu/handle/1774.2/37045
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Graham, Jason Scott. “Turbulence simulations: multiscale modeling and data-intensive computing methodologies.” 2014. Thesis, Johns Hopkins University. Accessed January 27, 2021.
http://jhir.library.jhu.edu/handle/1774.2/37045.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Graham, Jason Scott. “Turbulence simulations: multiscale modeling and data-intensive computing methodologies.” 2014. Web. 27 Jan 2021.
Vancouver:
Graham JS. Turbulence simulations: multiscale modeling and data-intensive computing methodologies. [Internet] [Thesis]. Johns Hopkins University; 2014. [cited 2021 Jan 27].
Available from: http://jhir.library.jhu.edu/handle/1774.2/37045.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Graham JS. Turbulence simulations: multiscale modeling and data-intensive computing methodologies. [Thesis]. Johns Hopkins University; 2014. Available from: http://jhir.library.jhu.edu/handle/1774.2/37045
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
8.
Lai, Ang-chih.
Numerical model of carbon dissolution in liquid iron.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459
► In this study, a numerical model is built to investigate the factors on carbon dissolution rate and develop a lump system for carbon particle dissolution…
(more)
▼ In this study, a
numerical model is built to investigate the factors on carbon dissolution rate and develop a lump system for carbon particle dissolution in hot liquid metal. We assume the carbon particles dissolve in the molten iron is a quasi-steady process. Therefore, the steady state model has been developed.
The
simulation data shows the distribution of mass dissolution rate at the particle surface is significantly affected by the flow circulation behind a particle as a relative flow velocity is applied. The lump system has been developed by the correlation of Reynolds number and Schmidt number, which can predict the carbon particles dissolve at times of different state. The correlation of mass/heat transfer are as following:
Sh=2.81+0.52 Re
0.52 Sc
0.38
Nu=0.53+0.27 ãReã
034 Pr
0.16
The study also established a transient model, and compare the time of dissolution between two models.
Simulation results of transient model show that when the Reynolds number is smaller, the dissolution rate of carbon particles goes to be slightly longer.in addition this study also building a two dimension injection model through the
simulation result of different model confirm the reliability of lump system
Advisors/Committee Members: Sheng-Yen Hsu (committee member), Tsou, Ying (chair), Chien-Hsiung Tsai (chair).
Subjects/Keywords: Numerical simulation; liquid iron; carbon dissolution
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lai, A. (2014). Numerical model of carbon dissolution in liquid iron. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lai, Ang-chih. “Numerical model of carbon dissolution in liquid iron.” 2014. Thesis, NSYSU. Accessed January 27, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lai, Ang-chih. “Numerical model of carbon dissolution in liquid iron.” 2014. Web. 27 Jan 2021.
Vancouver:
Lai A. Numerical model of carbon dissolution in liquid iron. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Jan 27].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lai A. Numerical model of carbon dissolution in liquid iron. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0805114-100459
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
9.
Shue, Nai-Shen.
Numerical simulation of Large Solar Hot Water system in storage tank.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906112-171826
► This research is aimed to study the storage tank design parameters effects on the efficiency of the large solar hot water system. Detailed CFD simulation…
(more)
▼ This research is aimed to study the storage tank design parameters effects on the efficiency of the large solar hot water system. Detailed CFD
simulation for the storage tank coupled with TRNSYS program
simulation for the entire solar hot water system will be performed to study the system performance under various thermal stratification baffles design for the storage tank. The study is made for three representative cities of Taiwan by input their typical-meteorological-year data (TMY data). The results indicate the performance of a large solar hot water system can be significantly improved with proper designed thermal stratification baffles in the storage tank.
Advisors/Committee Members: Huang, Jen-Chih (chair), Yang, Ru (committee member), Chen, Long-Jeng (chair).
Subjects/Keywords: Forced convection; Storage tank; Numerical simulation; Obstacle
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shue, N. (2012). Numerical simulation of Large Solar Hot Water system in storage tank. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906112-171826
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shue, Nai-Shen. “Numerical simulation of Large Solar Hot Water system in storage tank.” 2012. Thesis, NSYSU. Accessed January 27, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906112-171826.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shue, Nai-Shen. “Numerical simulation of Large Solar Hot Water system in storage tank.” 2012. Web. 27 Jan 2021.
Vancouver:
Shue N. Numerical simulation of Large Solar Hot Water system in storage tank. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Jan 27].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906112-171826.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shue N. Numerical simulation of Large Solar Hot Water system in storage tank. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0906112-171826
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Utah
10.
Li, Zhan.
Studying the genesis of typhoon Nuri (2008) with numerical simulations and data assimilation.
Degree: PhD, Atmospheric Sciences, 2013, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3482/rec/2297
► Forecasting tropical cyclone (TC) genesis is a challenging problem. Thisdissertation attempts to understand the following questions through studying the genesisof Typhoon Nuri (2008) with numerical…
(more)
▼ Forecasting tropical cyclone (TC) genesis is a challenging problem. Thisdissertation attempts to understand the following questions through studying the genesisof Typhoon Nuri (2008) with numerical simulations and data assimilation: 1) What arethe atmospheric conditions and processes that contribute to Nuri’s genesis and early rapidintensification? 2) To what extent can data assimilation improve the forecasts of Nuri’sgenesis?To address the first question, numerical simulations of Nuri’s genesis areconducted using an advanced research version of the Weather Research and Forecasting(WRF) model. First, initial and boundary conditions derived from two global analyses arefound to lead to remarkably different simulations of Nuri’s genesis in developing andnondeveloping cases. It is also found that the convective development into the pre-Nuricore region is a critical process for Nuri’s genesis. A strong midlevel vortex and a moistenvironment provide the favorable conditions for the convective development. Inducedby the persistent deep convection, diabatic heating at upper levels is produced from latentheat release. This substantial warming at upper levels results in the drop in Nuri’sminimum central sea level pressure.Next, the sensitivity of numerical simulations of Nuri’s genesis to the modelhorizontal resolution is examined. Results show that the simulation at a coarse-resolution(e.g., 12 km) better predicts Nuri’s rapid intensification than that at a higher resolution(e.g., 4 km). Specifically, the simulation at the coarser resolution produces strongconvective bursts and diabatic heating in the inner core region and also stronger warmingin the upper atmosphere, thus leading to a lower minimum sea level pressure (MSLP).Further experiments suggest that an appropriate microphysics scheme (e.g., the twomomentMorrison scheme) and a later initialization time (after Nuri’s early development)could help the high-resolution simulation better capture Nuri’s rapid intensification.Finally, numerical experiments are conducted to examine the impact of radar dataassimilation on numerical simulations of Nuri’s genesis using a four-dimensionalvariational data assimilation (4D-VAR) method. The radar data assimilation results insignificant improvements in the numerical simulation of Nuri’s genesis. Severalconfigurations of data assimilation are evaluated. Specifically, assimilation of radialvelocity leads to more improvement in intensity forecasts, whereas track forecasts arebetter simulated by the assimilation of radar-retrieved wind components. Improvedanalysis and forecasts are obtained when both radial velocity and retrieved winds areassimilated. In addition, 4D-VAR performs better than three-dimensional variational dataassimilation (3D-VAR) in radar data assimilation. The positive impact of radar dataassimilation can be attributed to the improved simulations of convective evolution andthe enhanced midlevel vortex and moisture conditions.
Subjects/Keywords: Data assimilation; Numerical simulation; Tropical cyclone genesis
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, Z. (2013). Studying the genesis of typhoon Nuri (2008) with numerical simulations and data assimilation. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3482/rec/2297
Chicago Manual of Style (16th Edition):
Li, Zhan. “Studying the genesis of typhoon Nuri (2008) with numerical simulations and data assimilation.” 2013. Doctoral Dissertation, University of Utah. Accessed January 27, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3482/rec/2297.
MLA Handbook (7th Edition):
Li, Zhan. “Studying the genesis of typhoon Nuri (2008) with numerical simulations and data assimilation.” 2013. Web. 27 Jan 2021.
Vancouver:
Li Z. Studying the genesis of typhoon Nuri (2008) with numerical simulations and data assimilation. [Internet] [Doctoral dissertation]. University of Utah; 2013. [cited 2021 Jan 27].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3482/rec/2297.
Council of Science Editors:
Li Z. Studying the genesis of typhoon Nuri (2008) with numerical simulations and data assimilation. [Doctoral Dissertation]. University of Utah; 2013. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3482/rec/2297
University of Alberta
11.
Wilkes, Jason.
Numerical simulation of Ricci flow on a class of manifolds
with non-essential minimal surfaces.
Degree: MS, Department of Mathematical and Statistical
Sciences, 2011, University of Alberta
URL: https://era.library.ualberta.ca/files/12579t30w
► In the last three decades, the Ricci flow has proved to be an extremely useful tool in mathematics and physics. We explore numerically the long…
(more)
▼ In the last three decades, the Ricci flow has proved
to be an extremely useful tool in mathematics and physics. We
explore numerically the long time existence of the Ricci-DeTurck
flow and the List flow for a one-parameter family of Riemannian
manifolds with non-essential minimal surfaces. This class of
metrics is constructed to be an intermediate case between the
corseted spheres examined by Garfinkle and Isenberg, and the RP3
geon explored by Balehowsky and Woolgar. We find that the
Ricci-DeTurck flow of these manifolds depends on the value of a
geometric parameter, with immortal flow below a critical parameter
value, and singularity formation above it. We also examine the List
flow of this family of manifolds with and without a stable minimal
surface, we compare the long time existence properties to those
observed in the case of the Ricci flow, and we use these results to
gain insights into both the results obtained by Gulcev, Oliynyk,
and Woolgar, and the general phenomena of singularity formation and
critical behavior in Ricci flow.
Subjects/Keywords: Ricci flow; Numerical Simulation; Riemannian Geometry
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wilkes, J. (2011). Numerical simulation of Ricci flow on a class of manifolds
with non-essential minimal surfaces. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/12579t30w
Chicago Manual of Style (16th Edition):
Wilkes, Jason. “Numerical simulation of Ricci flow on a class of manifolds
with non-essential minimal surfaces.” 2011. Masters Thesis, University of Alberta. Accessed January 27, 2021.
https://era.library.ualberta.ca/files/12579t30w.
MLA Handbook (7th Edition):
Wilkes, Jason. “Numerical simulation of Ricci flow on a class of manifolds
with non-essential minimal surfaces.” 2011. Web. 27 Jan 2021.
Vancouver:
Wilkes J. Numerical simulation of Ricci flow on a class of manifolds
with non-essential minimal surfaces. [Internet] [Masters thesis]. University of Alberta; 2011. [cited 2021 Jan 27].
Available from: https://era.library.ualberta.ca/files/12579t30w.
Council of Science Editors:
Wilkes J. Numerical simulation of Ricci flow on a class of manifolds
with non-essential minimal surfaces. [Masters Thesis]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/12579t30w
Kyoto University / 京都大学
12.
GHIMIRE, BIDUR.
HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究.
Degree: 博士(工学), 2009, Kyoto University / 京都大学
URL: http://hdl.handle.net/2433/85382
;
http://dx.doi.org/10.14989/doctor.k14916
► In this study, a comprehensive approach including mathematical, numerical and experimental study has been taken in order to develop new models for describing free surface…
(more)
▼ In this study, a comprehensive approach including mathematical, numerical and experimental study has been taken in order to develop new models for describing free surface flow behavior in porous media. The study suggested that modeling free-surface flow in porous media is possible using a single equation capable of showing proper transition between inertial and classical Darcian flow, based on the similarity distribution functions of depth and velocity. The developed integral model inherits both the flow regimes as depicted in the analysis. For both laminar and turbulent flows through porous media, the integral models give satisfactory results. Also the proposed algorithm for numerical simulation is capable of solving various problems of free-surface flow through porous media. This study adds a new dimension to fluid flow in porous media by replacing Darcy's equation with new models that are capable of representing both Darcy and non-Darcy flow behaviors. These are new nonlinear ordinary differential equations inherited both the flow regimes investigated. Integral formulations for unsteady depth distribution, velocity and front speed under constant water level and constant flux discharge inlet conditions have been developed based on similarity law. The formulations presented provide additional analytical insight about the intrusion dynamics. It is pointed out that, based on the self-similarity analysis, the temporal intrusion processes can be categorized into the inertia-pressure (IP) and the pressure-drag (PD) regimes. The early inertia-pressure regime is followed by the pressure-drag regime. In addition, the integral models proposed can be successfully used for the solution of a host of other nonlinear problems that admit self-similarity. The analytical and numerical solutions for constant inlet water level condition are verified with experimental observations. The unsteady distributions of flow depth, inflow velocity and front speeds are compared for various porous media characterized by its corresponding porosity and permeability. Analyses indicate that the integral models clearly represent the nonlinear flow behavior in porous media both in laminar and turbulent flow conditions. The integral model results are in agreement with those obtained by similarity solution for the temporal change of velocity, depth at inlet and front positions. The thesis also presents a computational fluid dynamics (CFD) model developed for the analysis of unsteady free-surface flows through porous media. Vertical two-dimensional numerical simulations are carried out for the free-surface flow inside the porous media governed by a set of Navier-Stokes equations extended for porous media flow. This model includes the convective and local inertia terms along with viscous diffusion term and resistance term comprising Darcy's linear resistance and Forchheimer's inertial resistance terms. The Finite volume method is applied using constrained interpolated propagation (CIP) method and highly simplified marker and cell (HSMAC) type pressure…
Subjects/Keywords: Hydraulics; Porous Media; Groundwater; Infiltration; Numerical Simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
GHIMIRE, B. (2009). HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究. (Thesis). Kyoto University / 京都大学. Retrieved from http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
GHIMIRE, BIDUR. “HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究.” 2009. Thesis, Kyoto University / 京都大学. Accessed January 27, 2021.
http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
GHIMIRE, BIDUR. “HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究.” 2009. Web. 27 Jan 2021.
Vancouver:
GHIMIRE B. HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究. [Internet] [Thesis]. Kyoto University / 京都大学; 2009. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
GHIMIRE B. HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究. [Thesis]. Kyoto University / 京都大学; 2009. Available from: http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cornell University
13.
Popov, Pavel.
Advances In Particle/Finite Volume Algorithms For Turbulent Reactive Flows.
Degree: PhD, Aerospace Engineering, 2013, Cornell University
URL: http://hdl.handle.net/1813/33920
► In the field of turbulent reactive flow simulations, hybrid particle/finite volume large eddy simulation/probability density function (LES/PDF) methods have been shown to be highly accurate…
(more)
▼ In the field of turbulent reactive flow simulations, hybrid particle/finite volume large eddy
simulation/probability density function (LES/PDF) methods have been shown to be highly accurate in simulating laboratory-scale flames. Their strengths lie in the combination of the large eddy
simulation procedure's ability to resolve the large, non-universal scales of turbulence, combined with the fact that probability density function models for turbulent combustion require no closure for the highly non-linear chemistry source term. This work presents advances in such hybrid particle/finite volume LES/PDF algorithms for turbulent reactive flows. New time stepping, interpolation, and coupling schemes have been proposed with the goal of reducing particle mass consistency (PMC) error (defined as the discrepancy between particle mass density and resolved finite volume density) and overall
simulation error. The Multi-step Second-order Runge-Kutta (MRK2) integration scheme is an ODE integration scheme designed for reducing PMC errors when applied to discontinuous velocity fields. When applied to a discontinuous velocity field such as might be produced by a state-of-the art velocity interpolation scheme, MRK2 preserves the continuity of the Lagrangian position mapping and is second-order convergent in time, as opposed to a standard second-order Runge-Kutta scheme, which is only first-order convergent in time when applied to a discontinuous velocity field. The Direct Richardson p-th order (DRp) is a conceptually new family of SDE integration schemes which are weakly p-th order accurate in time, where p is an arbitrary positive integer. Unlike standard SDE integration schemes, which are based on matching appropriate terms in the Ito-Taylor expansion of the stochastic process, the DRp schemes work via Richardson extrapolation between the probability density functions of a set of first-order accurate Euler approximations with differing time steps. In the context of the Large Eddy
Simulation/Probability Density Function (LES/PDF) code developed by the Turbulence and Combustion Group at Cornell University, a PDF to LES density coupling scheme via a transported specific volume (TSV) has been developed. While coupling approaches similar to TSV have been used previously in LES/PDF application, the present implementation is the first to allow overall second-order accuracy of the LES/PDF code in space and time. New implicit and explicit schemes for PMC error reduction schemes have been developed and tested in the context of the Sandia-Sydney bluff-body flame. Implicit PMC preservation schemes include new velocity and diffusivity interpolation algorithms, and explicit PMC error correction is achieved via a corrective velocity. While corrective velocity schemes have been used previously, the present algorithm, featuring a smoothed version of the PMC error field, is capable of maintaining the same PMC error levels with a corrective velocity of lower magnitude. Finally, the LES/PDF algorithm, developed by the Turbulence and Combustion group at…
Advisors/Committee Members: Pope, Stephen Bailey (chair), Vladimirsky, Alexander B. (committee member), Caughey, David Alan (committee member).
Subjects/Keywords: numerical algorithms; turbulent reactive flows; stochastic simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Popov, P. (2013). Advances In Particle/Finite Volume Algorithms For Turbulent Reactive Flows. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/33920
Chicago Manual of Style (16th Edition):
Popov, Pavel. “Advances In Particle/Finite Volume Algorithms For Turbulent Reactive Flows.” 2013. Doctoral Dissertation, Cornell University. Accessed January 27, 2021.
http://hdl.handle.net/1813/33920.
MLA Handbook (7th Edition):
Popov, Pavel. “Advances In Particle/Finite Volume Algorithms For Turbulent Reactive Flows.” 2013. Web. 27 Jan 2021.
Vancouver:
Popov P. Advances In Particle/Finite Volume Algorithms For Turbulent Reactive Flows. [Internet] [Doctoral dissertation]. Cornell University; 2013. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1813/33920.
Council of Science Editors:
Popov P. Advances In Particle/Finite Volume Algorithms For Turbulent Reactive Flows. [Doctoral Dissertation]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/33920
14.
Srivastava, Kishor Kumar.
Numerical Simulation of Strong Discontinuities in
Conducting Plasma;.
Degree: 1992, Bundelkhand University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/12039
newline
Bibliography p.134
Advisors/Committee Members: Singh, V K.Subjects/Keywords: Numerical Simulation; Radiation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Srivastava, K. K. (1992). Numerical Simulation of Strong Discontinuities in
Conducting Plasma;. (Thesis). Bundelkhand University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/12039
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Srivastava, Kishor Kumar. “Numerical Simulation of Strong Discontinuities in
Conducting Plasma;.” 1992. Thesis, Bundelkhand University. Accessed January 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/12039.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Srivastava, Kishor Kumar. “Numerical Simulation of Strong Discontinuities in
Conducting Plasma;.” 1992. Web. 27 Jan 2021.
Vancouver:
Srivastava KK. Numerical Simulation of Strong Discontinuities in
Conducting Plasma;. [Internet] [Thesis]. Bundelkhand University; 1992. [cited 2021 Jan 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12039.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Srivastava KK. Numerical Simulation of Strong Discontinuities in
Conducting Plasma;. [Thesis]. Bundelkhand University; 1992. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/12039
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Saskatchewan
15.
Korneeva, Daria Y.
Numerical simulation of compressible gas flow coupled to heat conduction in two space dimensions.
Degree: 2011, University of Saskatchewan
URL: http://hdl.handle.net/10388/etd-05312011-143902
► The current thesis studies a model of two dimensional convection of an ideal gas in a rectangular domain having walls of finite thickness. The temperature…
(more)
▼ The current thesis studies a model of two dimensional convection of an ideal gas in a rectangular domain having walls of finite thickness. The temperature outside of walls is considered constant. Heat exchange between walls and outside/inside air is computed using Newton's
law of cooling. Heat transfer inside walls is modelled with the heat equation. The mathematical model inside enclosure involves Navier-Stokes equations coupled with equation of state for gas. The model is numerically studied using the method of large particles. One of the main goals of the current thesis was to develop a software in C# language for
numerical solution of the above-described model. Physically meaningful results, including stream lines and distribution of parameters of gas and temperature inside solid walls were obtained.
Advisors/Committee Members: Cheviakov, Alexei F., Butler, Sam, Bickis, Miķelis G., Patrick, George.
Subjects/Keywords: Navier-Stokes system; numerical simulation; Fluid dynamics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Korneeva, D. Y. (2011). Numerical simulation of compressible gas flow coupled to heat conduction in two space dimensions. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-05312011-143902
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Korneeva, Daria Y. “Numerical simulation of compressible gas flow coupled to heat conduction in two space dimensions.” 2011. Thesis, University of Saskatchewan. Accessed January 27, 2021.
http://hdl.handle.net/10388/etd-05312011-143902.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Korneeva, Daria Y. “Numerical simulation of compressible gas flow coupled to heat conduction in two space dimensions.” 2011. Web. 27 Jan 2021.
Vancouver:
Korneeva DY. Numerical simulation of compressible gas flow coupled to heat conduction in two space dimensions. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/10388/etd-05312011-143902.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Korneeva DY. Numerical simulation of compressible gas flow coupled to heat conduction in two space dimensions. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/etd-05312011-143902
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
16.
Yang, Junjie.
The Development Of A Numerical Model Applicable To Dual Porosity Hydrocarbon Reservoirs With Complex Well Structures.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/23587
► Multilateral drilling and completion technology has been developed and widely applied in hydrocarbon reservoirs. Other than traditional wellbore design which focuses on wellbore length and…
(more)
▼ Multilateral drilling and completion technology has been developed and widely applied in hydrocarbon reservoirs. Other than traditional wellbore design which focuses on wellbore length and placement, several new factors need to be considered and optimized for complex well architectures such as number of branches, dip angles, and lateral spacing. A
numerical simulator specifically designed for complex well configuration is necessary to effectively simulate and understand the production performance of such systems.
In the study, a 3-dimensional, multi-phase
numerical model was developed for dual porosity hydrocarbon reservoir which accommodates various well architectures. Horizontal wellbore, multi-lateral wells, and slanted or tilted branches from the stem well are considered. Dual porosity model is embedded in the
numerical model to simulate reservoir with highly developed natural fracture system. The convection-dominant flow in highly permeable fracture is governed by Darcy’s Law, while the less permeable matrix serves as a source to feed into the fracture. As the traditional wellbore models are not suitable to accurately represent complicated well configuration, accordingly, the simulator adapts a Local Grid Refinement (LGR) technique to improve the accuracy. Validated by both analytical solution and commercial simulator, the
numerical model is proved to generate a more accurate production decline behavior.
Advisors/Committee Members: Turgay Ertekin, Dissertation Advisor/Co-Advisor, Luis Ayala, Committee Member, Yilin Wang, Committee Member, Cengiz Camci, Committee Member.
Subjects/Keywords: Multilateral wells; Local grid refinement; Numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yang, J. (2014). The Development Of A Numerical Model Applicable To Dual Porosity Hydrocarbon Reservoirs With Complex Well Structures. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/23587
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yang, Junjie. “The Development Of A Numerical Model Applicable To Dual Porosity Hydrocarbon Reservoirs With Complex Well Structures.” 2014. Thesis, Penn State University. Accessed January 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/23587.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yang, Junjie. “The Development Of A Numerical Model Applicable To Dual Porosity Hydrocarbon Reservoirs With Complex Well Structures.” 2014. Web. 27 Jan 2021.
Vancouver:
Yang J. The Development Of A Numerical Model Applicable To Dual Porosity Hydrocarbon Reservoirs With Complex Well Structures. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Jan 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/23587.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yang J. The Development Of A Numerical Model Applicable To Dual Porosity Hydrocarbon Reservoirs With Complex Well Structures. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/23587
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
17.
Zeinijahromi, Mohamad.
Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/19717
► In the past decades, development of tight gas reservoirs has become more important. These low permeability reservoirs need to be stimulated effectively with hydraulic fracturing…
(more)
▼ In the past decades, development of tight gas reservoirs has become more important. These low permeability reservoirs need to be stimulated effectively with hydraulic fracturing to produce economically. Stimulation design has improved with better understanding these unconventional reservoirs, advances in modeling and study of flow mechanisms.
Conventional fracture propagation models predict fracture geometry based on fracture fluid mechanics, rock mechanics, petrophysics and empirical/analytical leak-off models. Reservoir flow simulators are then used to evaluate post-fracture well performances. These approaches are called de-coupled modeling. It is a challenge to couple these two processes, particularly when dealing with large amounts of input data. Furthermore decoupled modeling is a time-intensive job that requires a coordinated effort from stimulation and reservoir engineers. This approach may not work in low-permeability reservoirs because the hydraulic fracture propagation is complex, fracture fluid leak-off is pressure/reservoir/fracture dependent and there are changes in in-situ stress and permeability during and after a fracture treatment. It has been recognized that fluid loss can be computed directly by solving the multiphase flow equations in porous media. Such an approach is more general and does not have many of the assumptions in decoupled models. Models based on this approach are called coupled models. Hydraulic fracturing is an integrated process of injection of fracture fluid, fracture propagation, proppant transport, clean-up and multi-phase flow through the reservoir. Available coupled models are not fully integrated as they were developed to simulate just one or two of these steps.
The main objective of this research is to develop an integrated coupled model which is capable of fully simulating reservoir flow, fracture propagation, proppant distribution, flowback, long term gas recovery and resulted stress change through a stationary reservoir/stress grid system. The model uses a three-dimensional, three-phase finite difference reservoir flow simulator coupled with a finite difference geomechanics model where both are applied on the same grid system. The model has been validated with published data in the literature.
Using the developed model, parametric studies have been carried out to quantify important factors affecting fracture and recovery processes such as injection rate, treatment volume, proppant type, flowback rate and flowing bottom hole pressure (FBHP). The model enables us to simulate and compare different scenarios and suggest the optimized hydraulic fracturing design. The new findings lead to better understandings of hydraulic fracturing and well performances in tight gas reservoirs.
Advisors/Committee Members: Yilin Wang, Dissertation Advisor/Co-Advisor, Turgay Ertekin, Dissertation Advisor/Co-Advisor, Russell Taylor Johns, Committee Member, Terry Engelder, Committee Member.
Subjects/Keywords: Numerical Modelilng; Hydraulic Fracturing Modeling; Reservoir Simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zeinijahromi, M. (2013). Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19717
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zeinijahromi, Mohamad. “Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs.” 2013. Thesis, Penn State University. Accessed January 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/19717.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zeinijahromi, Mohamad. “Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs.” 2013. Web. 27 Jan 2021.
Vancouver:
Zeinijahromi M. Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Jan 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/19717.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zeinijahromi M. Development Of A Three-dimensional, Three-phase Coupled Model For Simulating Hydraulic Fracture Propagation And Long-term Recovery In Tight Gas Reservoirs. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19717
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
18.
Wu, Wen.
Numerical study of an impinging jet with embedded vortices
.
Degree: Mechanical and Materials Engineering, 2016, Queens University
URL: http://hdl.handle.net/1974/14045
► Large-eddy simulations of round forced impinging jets at laboratory scale are performed, as a simplified model of the helicopter rotor wake; the goals were to…
(more)
▼ Large-eddy simulations of round forced impinging jets at laboratory scale are performed, as a simplified model of the helicopter rotor wake; the goals were to understand the dynamics of the vortices, and to help develop engineering correlation and models. First, I studied the flow over smooth surfaces, then the Reynolds number effects and the performance of lower-level models in this flow were explored. Finally, I investigated surface roughness effects.
The interaction between the vortices and the wall resulted in the formation of secondary vorticity that was lifted up and rolled around the primary vortex. These large-scale vortices play an important role in
determining the flow. The dynamics of the vortex evolution are initially dominated by an inviscid mechanism. As the interaction with the wall begins, however, the contribution of turbulent diffusion to the vorticity transport (TVD) becomes the leading term weakening the primary vortex. This phenomenon is extremely robust, leading to similar vortex decay rates regardless of the level of turbulence in the jet and the nature of the near-wall flow. The mean-flow three-dimensionality due to a short-wavelength azimuthal instability also plays a role in the evolution of the vortices.
Surface roughness significantly modified the near-wall flow, including displacement of the velocity profile, increase of wall stress, and amplification of turbulence levels. The near-wall flow changes due to the roughness are advected to the outer layer during the separation of the secondary vorticity, rather than being confined in the vicinity of the roughness elements. The robust TVD mechanism, however, prevent the vortices from being strongly affected by these changes.
This flow is particularly challenging for turbulence models. The tested RANS models exhibited poor performance. The error sources were first identified as their incapability in predicting both the shear-layer instability, and the local unsteady separation. Secondly, the well-known shortcomings of the eddy-viscosity assumption in wall jets were amplified here by the counter-gradient transport during the vortex evolution. Finally, since the TVD term depends on the second derivative of the shear stress, the RANS model errors were naturally amplified. The WMLES predicted vortex decay in good agreement with the resolved LES data.
Subjects/Keywords: Numerical simulation
;
impinging jet
;
roughness
;
vortices
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wu, W. (2016). Numerical study of an impinging jet with embedded vortices
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/14045
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Wen. “Numerical study of an impinging jet with embedded vortices
.” 2016. Thesis, Queens University. Accessed January 27, 2021.
http://hdl.handle.net/1974/14045.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Wen. “Numerical study of an impinging jet with embedded vortices
.” 2016. Web. 27 Jan 2021.
Vancouver:
Wu W. Numerical study of an impinging jet with embedded vortices
. [Internet] [Thesis]. Queens University; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1974/14045.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu W. Numerical study of an impinging jet with embedded vortices
. [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/14045
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
19.
Chen, Junhong.
Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere.
Degree: PhD, 2017, University of New Hampshire
URL: https://scholars.unh.edu/dissertation/140
► Interstellar pickup ions constitute a charged particle population that originates from interstellar neutrals inside the heliosphere. They are produced by photoionization, charge exchange with…
(more)
▼ Interstellar pickup ions constitute a charged particle population that originates from interstellar neutrals inside the heliosphere. They are produced by photoionization, charge exchange with solar wind ions, and electron impact ionization (EI). Once ionized, they are picked up by the interplanetary magnetic field (IMF) and rapidly swept outward with the solar wind. Typically, pickup ion distributions have been described in terms of a velocity distribution function that evolves through fast pitch angle scattering followed by adiabatic cooling during radial transport in the reference frame of the solar wind [e.g., Vasyliunas & Siscoe, 1976, VS76 hereafter].
In the VS76 model, the slope of the isotropic velocity distributions is controlled by the combination of the ionization rate and the cooling process. Thus far, for the cooling index that relates the slope of the velocity distribution to the radial transport and expansion of the pickup ions a constant value of 3/2 has been widely used. The implicit assumptions to arrive at this value are immediate PUI isotropization due to pitch angle scattering and solar wind expansion with the square of the distance from the Sun. Any experimental determination of the cooling index depends on the knowledge of the ionization rate and its spatial variation, as well as solar wind and interplanetary conditions. In this thesis, we study their influences on the PUI cooling index and separate them by making use of the two complementary helium PUI data sets from SWICS instrument on the ACE spacecraft, and PLASTIC instrument on STEREO spacecraft. We use the pickup ion observations from ACE SIWCS in the last solar cycle to determine the cooling index, and the possible effects of the electron impact ionization on the determination of the cooling index. With pickup ion observations from STEREO PLASTIC, we determine how solar wind expansion patterns affect the cooling index.
We find that the cooling index varies substantially with solar activity and suspect that these variations may be due to the influence of electron impact ionization, solar wind structures, and slow pitch angle scattering. Electron impact ionization, which does not scale as 1/r2, is shown to have negligible influence on the cooling index and its variations. However, the effects of solar wind compression and rarefaction regions are found to be important. Comparisons of the pickup ion cooling behavior in the compression and rarefaction regions show that the radial solar wind expansion behaviors that differer from the usual 1/r2 scaling may play the leading roles in the observed variations. A kinetic model of PUI is used to quantitatively describe their behavior in co-rotating interaction regions (CIR). The simulated distributions mimic closely the observed variations in the cooling behavior of PUIs in these regions. In addition, suprathermal tails appear to emerge from the PUI distributions inside compression regions, which provide further evidence that some particles of this population are accelerated locally…
Advisors/Committee Members: Eberhard Moebius, Nathan A Schwadron, Philip A Isenberg.
Subjects/Keywords: Data Analysis; Numerical Simulation; Pickup Ions; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, J. (2017). Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere. (Doctoral Dissertation). University of New Hampshire. Retrieved from https://scholars.unh.edu/dissertation/140
Chicago Manual of Style (16th Edition):
Chen, Junhong. “Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere.” 2017. Doctoral Dissertation, University of New Hampshire. Accessed January 27, 2021.
https://scholars.unh.edu/dissertation/140.
MLA Handbook (7th Edition):
Chen, Junhong. “Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere.” 2017. Web. 27 Jan 2021.
Vancouver:
Chen J. Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere. [Internet] [Doctoral dissertation]. University of New Hampshire; 2017. [cited 2021 Jan 27].
Available from: https://scholars.unh.edu/dissertation/140.
Council of Science Editors:
Chen J. Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere. [Doctoral Dissertation]. University of New Hampshire; 2017. Available from: https://scholars.unh.edu/dissertation/140
University of Illinois – Chicago
20.
Fang, Ruonan.
Assessment of a Microslip Model for the Numerical Simulation of Underplatform Damper Dynamics.
Degree: 2014, University of Illinois – Chicago
URL: http://hdl.handle.net/10027/19040
► This thesis work was developed in the Department of Mechanical and Aerospace Engineering (DIMEAS) at Politecnico of Turin. It focuses on under-platform damper kinematics and…
(more)
▼ This thesis work was developed in the Department of Mechanical and Aerospace Engineering
(DIMEAS) at Politecnico of Turin.
It focuses on under-platform damper kinematics and its damping capabilities estimation by
means of a dedicated, improved
numerical model which includes the e ffects of a phenomenon
called micro-slip.Taking over the advantage of AERMEC laboratory's test rigs set to investigate
the relationship between the blade platform displacements and the contact forces, it was possible
to assess the developed model against the observed experimental data. After an overview of the existing experimental-
numerical
method developed by the AERMEC group during the previous years, with particular relevance to the weaker cases in which the experimental has a minor match to the
simulation,
index of a possible neglected micro-slip e ffect in the contact model. Therefore the improved contact model will be established and later applied on a series of cases
on two types of contact geometries. The results of simulations will be compared and analysed
closely in order to have a better understanding of the working ranges in which the phenomenon
of micro-slip has a wider impact on the overall energy dissipation.
Advisors/Committee Members: Royston, Thomas (advisor), Gola, Muzio M. (committee member), Scott, Michael (committee member).
Subjects/Keywords: microslip contact underplatform damper dynamics numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fang, R. (2014). Assessment of a Microslip Model for the Numerical Simulation of Underplatform Damper Dynamics. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19040
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fang, Ruonan. “Assessment of a Microslip Model for the Numerical Simulation of Underplatform Damper Dynamics.” 2014. Thesis, University of Illinois – Chicago. Accessed January 27, 2021.
http://hdl.handle.net/10027/19040.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fang, Ruonan. “Assessment of a Microslip Model for the Numerical Simulation of Underplatform Damper Dynamics.” 2014. Web. 27 Jan 2021.
Vancouver:
Fang R. Assessment of a Microslip Model for the Numerical Simulation of Underplatform Damper Dynamics. [Internet] [Thesis]. University of Illinois – Chicago; 2014. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/10027/19040.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fang R. Assessment of a Microslip Model for the Numerical Simulation of Underplatform Damper Dynamics. [Thesis]. University of Illinois – Chicago; 2014. Available from: http://hdl.handle.net/10027/19040
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ottawa
21.
Maxwell, Brian McNeilly.
Turbulent Combustion Modelling of Fast-Flames and Detonations Using Compressible LEM-LES
.
Degree: 2016, University of Ottawa
URL: http://hdl.handle.net/10393/34122
► A novel approach to modelling highly compressible and reactive flows is formulated to provide high resolution closure of turbulent-scale reaction rates in the presence of…
(more)
▼ A novel approach to modelling highly compressible and reactive flows is formulated to provide high resolution closure of turbulent-scale reaction rates in the presence of very rapid transients in pressure and energy. For such flows, treatment of turbulent-micro scales are generally unattainable through traditional modelling techniques. To address this, the modelling strategy developed here is based on the Linear Eddy Model for Large Eddy Simulation (LEM-LES); a technique which has only previously been applied to weakly compressible flows. In the current formulation of the Compressible LEM-LES (CLEM-LES), special treatment of the energy balance on the model subgrid is accounted for in order for the model reaction rates to respond accordingly to strong shocks and rapid expansions, both of which may be present in reactive and supersonic flow fields.
In the current study, the model implemented is verified and validated for various 1D and 2D flow configurations in a compressible Adaptive Mesh Refinement (AMR) framework. In 1D test cases, laminar and turbulent flame speeds and structure have been reproduced. Also, detonation speeds and initiation events are also captured with the model. For 2D model validation, unsteady and turbulent detonation propagation and initiation events, in a narrow channel, are simulated. Both test cases involve premixed methane-oxygen mixture at low pressures. The model is found to capture well the two-dimensional detonation cellular structure, behaviour, and initiation events that are observed in corresponding shock tube experiments. Furthermore, the effect of turbulent mixing rates is investigated though a single tuning constant. It was found that by increasing the intensity of turbulent fluctuations present, detonations exhibit larger and more irregular cell structures. Furthermore, the intensity of turbulent fluctuations is found to also have an effect on initiation events.
Subjects/Keywords: compressible flow;
turbulent combustion;
explosions;
numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maxwell, B. M. (2016). Turbulent Combustion Modelling of Fast-Flames and Detonations Using Compressible LEM-LES
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/34122
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maxwell, Brian McNeilly. “Turbulent Combustion Modelling of Fast-Flames and Detonations Using Compressible LEM-LES
.” 2016. Thesis, University of Ottawa. Accessed January 27, 2021.
http://hdl.handle.net/10393/34122.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maxwell, Brian McNeilly. “Turbulent Combustion Modelling of Fast-Flames and Detonations Using Compressible LEM-LES
.” 2016. Web. 27 Jan 2021.
Vancouver:
Maxwell BM. Turbulent Combustion Modelling of Fast-Flames and Detonations Using Compressible LEM-LES
. [Internet] [Thesis]. University of Ottawa; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/10393/34122.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Maxwell BM. Turbulent Combustion Modelling of Fast-Flames and Detonations Using Compressible LEM-LES
. [Thesis]. University of Ottawa; 2016. Available from: http://hdl.handle.net/10393/34122
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Miami
22.
Hsu, Byron Che-Fu.
Analysis of Extracellular ATP Distribution in the Intervertebral Disc Using a Finite Element Model.
Degree: MS, Biomedical Engineering (Engineering), 2014, University of Miami
URL: https://scholarlyrepository.miami.edu/oa_theses/486
► Extracellular adenosine triphosphate (ATP) released from cells can mediate a diverse number of biological responses, such as cell secretion, inflammation, and immune reactions through…
(more)
▼ Extracellular adenosine triphosphate (ATP) released from cells can mediate a diverse number of biological responses, such as cell secretion, inflammation, and immune reactions through signaling pathways. According to Wang et al. (2013), the extracellular ATP concentration has been measured to accumulate to a high level in the nucleus pulposus (NP) region in the intervertebral disc (IVD), approximately 165 ?M. Since extracellular ATP is involved in a variety of cellular activities, the role of ATP distribution and accumulation in the IVD should be investigated. The objective of this study is to examine the effects of mechanical compression on the distribution of extracellular ATP and its adenine derivatives in the IVD using triphasic mechano-electrochemical theory. This theory describes the mechanical behavior and transport phenomena of charged hydrated soft tissue such as the IVD. Michaelis-Menten kinetics was used to model ATP hydrolysis and incorporated into a finite element model. Experiments were performed to measure Michaelis-Menten parameters of annulus fibrosus (AF) and NP cells. Results of the ATP hydrolysis experiments show that the maximum reaction velocity, Vmax, for AF cells is significantly greater than the value for NP cells. Thus, the extracellular ATP hydrolysis rate for AF cells could be significantly greater than the rate for NP cells. By comparing the results with the findings reported by Wang et al. (2013), the theoretical analysis indicated that mechanical loading may promote ATP hydrolysis and induce an intrinsic cellular response. Based on a finite element model, this study simulates the distribution of extracellular ATP and its adenine derivatives in the IVD under mechanical loading.
Advisors/Committee Members: Chun-Yuh Charles Huang, Francesco Travascio, Alicia Renee Jackson.
Subjects/Keywords: IVD; ATP; compression; Michaelis-Menten; numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hsu, B. C. (2014). Analysis of Extracellular ATP Distribution in the Intervertebral Disc Using a Finite Element Model. (Thesis). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_theses/486
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hsu, Byron Che-Fu. “Analysis of Extracellular ATP Distribution in the Intervertebral Disc Using a Finite Element Model.” 2014. Thesis, University of Miami. Accessed January 27, 2021.
https://scholarlyrepository.miami.edu/oa_theses/486.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hsu, Byron Che-Fu. “Analysis of Extracellular ATP Distribution in the Intervertebral Disc Using a Finite Element Model.” 2014. Web. 27 Jan 2021.
Vancouver:
Hsu BC. Analysis of Extracellular ATP Distribution in the Intervertebral Disc Using a Finite Element Model. [Internet] [Thesis]. University of Miami; 2014. [cited 2021 Jan 27].
Available from: https://scholarlyrepository.miami.edu/oa_theses/486.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hsu BC. Analysis of Extracellular ATP Distribution in the Intervertebral Disc Using a Finite Element Model. [Thesis]. University of Miami; 2014. Available from: https://scholarlyrepository.miami.edu/oa_theses/486
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manitoba
23.
Li, Sujuan.
Numerical instability study of supercritical water flowing upward in two heated parallel channels.
Degree: Mechanical Engineering, 2016, University of Manitoba
URL: http://hdl.handle.net/1993/31974
► A three dimensional numerical investigation of supercritical water flowing upward in two heated parallel channels was developed using a RANS model in the Computational Fluid…
(more)
▼ A three dimensional
numerical investigation of supercritical water flowing upward in two heated parallel channels was developed using a RANS model in the Computational Fluid Dynamics (CFD) code ANSYS CFX. The standard k- turbulence model with scalable wall functions was adopted throughout this
numerical study.
The effects of spatial and temporal grid sizes on flow instability were studied first. Then oscillatory instabilities of nine experimental cases were predicted using the CFX code. For comparison purposes, Chatoorgoon’s 1-D non-linear SPORTS code was also used to determine the instability boundary. These new
numerical results were compared with the experimental data and previous
numerical results by other investigators.
Additionally, the effects of changing the outlet plenum volume, the turbulent Prandtl number, the turbulence inlet conditions, the outlet K factor, the maximum iterations per time step in the transient analysis and the order of the transient scheme on the instability thresholds were examined.
Advisors/Committee Members: Chatoorgoon, Vijay (Mechanical Engineering), Birouk, Madjid (Mechanical Engineering).
Subjects/Keywords: CFD; numerical simulation; supercritical water; flow instability
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, S. (2016). Numerical instability study of supercritical water flowing upward in two heated parallel channels. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/31974
Chicago Manual of Style (16th Edition):
Li, Sujuan. “Numerical instability study of supercritical water flowing upward in two heated parallel channels.” 2016. Masters Thesis, University of Manitoba. Accessed January 27, 2021.
http://hdl.handle.net/1993/31974.
MLA Handbook (7th Edition):
Li, Sujuan. “Numerical instability study of supercritical water flowing upward in two heated parallel channels.” 2016. Web. 27 Jan 2021.
Vancouver:
Li S. Numerical instability study of supercritical water flowing upward in two heated parallel channels. [Internet] [Masters thesis]. University of Manitoba; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/1993/31974.
Council of Science Editors:
Li S. Numerical instability study of supercritical water flowing upward in two heated parallel channels. [Masters Thesis]. University of Manitoba; 2016. Available from: http://hdl.handle.net/1993/31974
Loughborough University
24.
Nekouie Esfahani, Mohammadreza.
Laser welding of dissimilar carbon steel to stainless steel 316L.
Degree: PhD, 2015, Loughborough University
URL: http://hdl.handle.net/2134/19760
► Laser welding of metals and alloys is extensively used in industry due to its advantages of controlled heating, narrow weld bead, low heat affected zone…
(more)
▼ Laser welding of metals and alloys is extensively used in industry due to its advantages of controlled heating, narrow weld bead, low heat affected zone (HAZ) and its ability to weld a wide range of metals and dissimilar metals. Laser welding of dissimilar metals such as carbon steels and stainless steel is still a challenging task, particularly due to the formation of brittle phases in the weld, martensitic formation in the HAZ and solidification cracking in the fusion zone. These issues can significantly deteriorate the strength of the welded joint. The aim of this work is to investigate the fundamental phenomena that occur inside the dissimilar weld zone and their effect on weld quality. In order to establish the key process variables, an initial study concentrated on the effect of different laser process parameters on dissimilar weld quality. In the second part of the work, a comprehensive study was performed to understand and subsequently control the alloying composition in laser dissimilar welding of austenitic stainless steel and low carbon steel. A dissimilar weld that is predominantly austenitic and homogeneous was obtained by controlling the melt pool dynamics through specific point energy and beam alignment. The significance of dilution and alloying elements on joint strength was established. A coupled CFD and FEM numerical model was developed to assist in understanding the melt pool dynamics and transportation processes of alloying elements. The model has been validated by a series of laser welding experiments using various levels of specific point energy. The laser welding characteristics in terms of geometric dimensions, surface morphology, alloying concentration, and dilution, were compared, and it is concluded that the specific point energy and laser beam position are the key parameters that can be controlled to obtain a weld bead with characteristics most suitable for industrial applications. In the third part of the work, a comparative study was performed to understand the significance of cooling rate, and alloying composition on the microstructure and phase structure of the dissimilar weld zone. Results show that the HAZ within the high carbon steel has significantly higher hardness than the weld area, which severely undermines the weld quality. A new heat treatment strategy was proposed based on the results of the numerical simulation, and it is shown to control the brittle phase formation in HAZ of high carbon steel. A series of experiments was performed to verify the developed thermo-metallurgical FEA model and a good qualitative agreement of the predicted martensitic phase distribution is shown to exist. Although this work is presented in the context of dissimilar laser welding of mild steel to stainless steel, the concept is applicable to any dissimilar fusion welding process.
Subjects/Keywords: 671.5; Laser dissimilar welding; Numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nekouie Esfahani, M. (2015). Laser welding of dissimilar carbon steel to stainless steel 316L. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/19760
Chicago Manual of Style (16th Edition):
Nekouie Esfahani, Mohammadreza. “Laser welding of dissimilar carbon steel to stainless steel 316L.” 2015. Doctoral Dissertation, Loughborough University. Accessed January 27, 2021.
http://hdl.handle.net/2134/19760.
MLA Handbook (7th Edition):
Nekouie Esfahani, Mohammadreza. “Laser welding of dissimilar carbon steel to stainless steel 316L.” 2015. Web. 27 Jan 2021.
Vancouver:
Nekouie Esfahani M. Laser welding of dissimilar carbon steel to stainless steel 316L. [Internet] [Doctoral dissertation]. Loughborough University; 2015. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/2134/19760.
Council of Science Editors:
Nekouie Esfahani M. Laser welding of dissimilar carbon steel to stainless steel 316L. [Doctoral Dissertation]. Loughborough University; 2015. Available from: http://hdl.handle.net/2134/19760
Delft University of Technology
25.
Timmer, M.A. (author).
The resonance frequency of tip-vortex cavitation.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f150f227-645f-444d-bfcf-5430344018b0
► Over time much research has been performed on the subject of cavitation. A recent development in this field is the investigation into the behaviour of…
(more)
▼ Over time much research has been performed on the
subject of cavitation. A recent development in this field is the investigation into the behaviour of the cavity within a propeller's tip-vortex. It is found that this cavity can produce a very distinct broadband sound-spectrum which can cause trouble on-board ships either by the sound itself or due to the coincidence with the natural frequencies of a ships structure, causing resonance problems. Recent research by Bosschers and Pennings have resulted in an engineering approach to the calculation of a center frequency of this specific type of cavitation sound. To validate this engineering method, measurements were performed by Pennings[2016] on a 2-bladed propeller in the cavitation tunnel at the Delft University of Technology. The purpose of these measurements was finding the resonance frequency of the tip-vortex cavity. From early measurements it was found that the self-exciting behaviour of the cavity, as it was found by Maines & Arndt[1997], could not be reproduced. To get the cavity to generate sound, an artificial wake was introduced which resulted in the distinct broadband sound-spectrum associated with tip-vortex cavitation. To investigate whether the velocity gradient introduced by the wake is sufficiently steep to excite the natural frequencies of the vortex cavity, velocity measurements have been performed from which a steep dip in the flow velocity was found near and behind the wake generator. Also a highly fluctuating behaviour of the flow, with large deviations from the mean flow, was found. These large spreads are associated with the broadband sound spectrum that comes with tip-vortex cavitation. From this it is concluded that the wake generator, as it is used in the measurements by Pennings[2016], gives a good approximation of a real wake. To be able to use the engineering method as a tool to predict the center frequency, a method is needed to accurately calculate the cavity radius and the associated circumferential velocity without the need of full scale tests. When such a method is available the resonance frequency associated with tip-vortex cavitation for a specific propeller can be calculated in the design stage of the ship and/or propeller. With this information available an educated trade-off can be made between the alteration of the propeller and the construction of the ship in order to prevent coinciding natural frequencies. To obtain the necessary cavitation information a
numerical simulation is performed of which the results show good agreement with measurement data. With this
simulation method a relatively fast and accurate prediction can be made of the center frequency of tip-vortex cavitation with the use of the engineering method. However, to grow the confidence in the results produced, further research should be performed. The current
numerical simulations have been performed for a very small propeller. It would be interesting to see whether the method, as it is described and tested in this thesis, also produces good results for a regular…
Advisors/Committee Members: Van Terwisga, T.J.C. (mentor), Pennings, P.C. (mentor).
Subjects/Keywords: tip vortex cavitation; center frequency; numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Timmer, M. A. (. (2015). The resonance frequency of tip-vortex cavitation. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f150f227-645f-444d-bfcf-5430344018b0
Chicago Manual of Style (16th Edition):
Timmer, M A (author). “The resonance frequency of tip-vortex cavitation.” 2015. Masters Thesis, Delft University of Technology. Accessed January 27, 2021.
http://resolver.tudelft.nl/uuid:f150f227-645f-444d-bfcf-5430344018b0.
MLA Handbook (7th Edition):
Timmer, M A (author). “The resonance frequency of tip-vortex cavitation.” 2015. Web. 27 Jan 2021.
Vancouver:
Timmer MA(. The resonance frequency of tip-vortex cavitation. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 27].
Available from: http://resolver.tudelft.nl/uuid:f150f227-645f-444d-bfcf-5430344018b0.
Council of Science Editors:
Timmer MA(. The resonance frequency of tip-vortex cavitation. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:f150f227-645f-444d-bfcf-5430344018b0
Delft University of Technology
26.
Feng, Kesong (author).
Numerical Simulation Of Bubble Screens For Mitigating Salt Intrusion Through Sea Locks.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:258e23af-51eb-491e-8886-f029c4dc32b5
► Salt intrusion through sea locks causes the mixing of fresh and salt water due to a gravity current. This process may occur gradually over tens…
(more)
▼ Salt intrusion through sea locks causes the mixing of fresh and salt water due to a gravity current. This process may occur gradually over tens of kilometers and affects the required quality of the inland water. A bubble screen alongside the locks is one of the available mitigating measures for this undesired phenomenon. However, current numerical simulations on bubble screens to mitigate salt intrusion are relatively scarce, and the validation of such models has not yet been thoroughly checked. The objective of this thesis is to study the performance of bubble screens for mitigating the salt intrusion using an Euler-Euler Computational Fluid Dynamics (CFD) model in Fluent 17.2. The work was conducted at TU Delft in collaboration with Deltares, a hydraulics institute in Delft in The Netherlands. First, a simulation of a gravity current is conducted to study the mixing of fresh and salt water in the absence of a bubble screen. The mass transport equation for the salt concentration, together with a linear approximation of the concentration-density relation, is involved into the governing equations. The results are validated with empirical predictions and experiments at Deltares of gravity currents to study the buoyancy effects of different turbulence submodels. Second, simulations of bubble screens in the fresh-fresh water system are performed and validated with particle image velocimetry (PIV) measurements conducted at Deltares to investigate the bubble screen dynamics. Larger flow circulations are generated with increasing air flow rates, while a constant surface current thickness of around 0.3 times the water depth is found for all cases. Lastly, bubble screens simulations for six different Froude air numbers Frair in the fresh-salt water system are conducted and validated with the dye measurements. The dimensionless number Frair serves as a ratio of the kinetic energy of the rising bubble plume to the potential energy of the gravity current. The salt transmission factor, defined as a ratio of the salt intrusion with mitigating measures to that without any measures, shows that Frair in the range of 0.93 - 1.08 is most efficient for mitigating salt intrusion. At a lower Frair, the salt water generally intrudes at the bottom area as a salt tongue, whereas the salt intrudes through the surface current for larger Frair owing to a higher rate of liquid entrainment into the bubble screen.
Energy and Process Technology
Advisors/Committee Members: Breugem, Wim-Paul (mentor), Pourquie, Mathieu (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Bubble Screens; Salt Intrusion; Numerical Simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Feng, K. (. (2019). Numerical Simulation Of Bubble Screens For Mitigating Salt Intrusion Through Sea Locks. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:258e23af-51eb-491e-8886-f029c4dc32b5
Chicago Manual of Style (16th Edition):
Feng, Kesong (author). “Numerical Simulation Of Bubble Screens For Mitigating Salt Intrusion Through Sea Locks.” 2019. Masters Thesis, Delft University of Technology. Accessed January 27, 2021.
http://resolver.tudelft.nl/uuid:258e23af-51eb-491e-8886-f029c4dc32b5.
MLA Handbook (7th Edition):
Feng, Kesong (author). “Numerical Simulation Of Bubble Screens For Mitigating Salt Intrusion Through Sea Locks.” 2019. Web. 27 Jan 2021.
Vancouver:
Feng K(. Numerical Simulation Of Bubble Screens For Mitigating Salt Intrusion Through Sea Locks. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 27].
Available from: http://resolver.tudelft.nl/uuid:258e23af-51eb-491e-8886-f029c4dc32b5.
Council of Science Editors:
Feng K(. Numerical Simulation Of Bubble Screens For Mitigating Salt Intrusion Through Sea Locks. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:258e23af-51eb-491e-8886-f029c4dc32b5
Delft University of Technology
27.
Konings, Swen (author).
Numerical simulations of core-annular flow through a horizontal pipe.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f613b72a-e8de-41f4-9a3d-4d9c8767d4ee
► Core-annular flow is an efficient flow regime for the transportation of viscous oils. The viscous oil in the core is surrounded and lubricated with an…
(more)
▼ Core-annular flow is an efficient flow regime for the transportation of viscous oils. The viscous oil in the core is surrounded and lubricated with an annulus of water. Water has a low viscosity and therefore reduces the pressure drop.
Numerical simulations are performed for horizontal core-annular flow by using the Volume of fluid (VOF) method to solve the Reynolds-averaged Navier-Stokes equations (RANS) in OpenFOAM. Periodic boundary conditions are used for a small pipe section. With periodic boundary conditions the maximum wavelength at the oil-water interface is imposed together with the oil and water holdup fractions.
Numerical results are compared with recent experimental data. Oil viscosities between 3338 cSt at 20°C and 383 cSt at 50°C are solved with a fixed total flow rate. The 20°C
simulation converged to the desired water cut of 20%, similar to the experiment. At this 20% water cut a comparable pressure gradient is found with the experiment. At higher temperatures (i.e. lower viscosities) deviations from the desired water cut of 20% are obtained. The different water cut values lead to differences between the
numerical and experimental pressure gradients. Additional simulations are carried out for the oil viscosity of 718 cSt at 40°C. Instead of a fixed total flow rate these simulations are solved with a fixed pressure gradient. This solving method is found to be considerable faster. Different holdup fractions and pressure gradients are imposed which resulted in different water cut and flow rate values.
Numerical results are interpolated for the experimental water cut values of 9%, 12% and 15% at similar flow rates. Differences of 98%, 24% and 37% are found for the water cut of 9%, 12% and 15% respectively. An interpolation is not possible for the experimental water cut of 20% as this experiment is outside the covered solution region of the
numerical results. This difference is caused due to an incorrectly used domain length. The study is finished with holdup estimations of the experiments. Flow visualizations from a high speed camera are used which are made during the experiments. Oil holdup fractions of 0.749 are found for a water cut of 20%. This holdup fraction corresponds exactly with the imposed holdup fraction for the different viscosity simulations which are solves with the fixed total flow rate. Only the 3338 cSt at 20°C converged, however, to the water cut of 20%.
Advisors/Committee Members: Henkes, Ruud (mentor), Ooms, Gijs (mentor), Pourquie, MAthieu (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Core-annular flow; numerical simulation; Multiphase flow
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Konings, S. (. (2017). Numerical simulations of core-annular flow through a horizontal pipe. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f613b72a-e8de-41f4-9a3d-4d9c8767d4ee
Chicago Manual of Style (16th Edition):
Konings, Swen (author). “Numerical simulations of core-annular flow through a horizontal pipe.” 2017. Masters Thesis, Delft University of Technology. Accessed January 27, 2021.
http://resolver.tudelft.nl/uuid:f613b72a-e8de-41f4-9a3d-4d9c8767d4ee.
MLA Handbook (7th Edition):
Konings, Swen (author). “Numerical simulations of core-annular flow through a horizontal pipe.” 2017. Web. 27 Jan 2021.
Vancouver:
Konings S(. Numerical simulations of core-annular flow through a horizontal pipe. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Jan 27].
Available from: http://resolver.tudelft.nl/uuid:f613b72a-e8de-41f4-9a3d-4d9c8767d4ee.
Council of Science Editors:
Konings S(. Numerical simulations of core-annular flow through a horizontal pipe. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:f613b72a-e8de-41f4-9a3d-4d9c8767d4ee
Delft University of Technology
28.
Ganapathy, Chandru (author).
Multiscale Reconstruction of Compositional Transport.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:24de2b60-9c17-4f28-a086-91ee9178ebe7
► Designing strategies for efficient oil production from reservoirs rely heavily on reservoir simulation studies, which in-turn is based on various nonlinear formulations. It is therefore…
(more)
▼ Designing strategies for efficient oil production from reservoirs rely heavily on reservoir
simulation studies, which in-turn is based on various nonlinear formulations. It is therefore very important to develop a robust
simulation model that captures the flow of various components present in different phases and the associated thermodynamic and chemical interactions. A compositional formulation is a reliable option for understanding these complex subsurface processes. However, this type of model has a great computational cost, since the number of equations (nc) that needs to be solved in each grid block increases proportionally with the number of components employed. The solution of the multicomponent multiphase flow problem is obtained by solving the associated nonlinear governing equation describing the conservation of mass, thereby determining the pressure (P) and compositional changes (Z) of the system. On the other hand, an Equation of state (EoS) model is employed to describe the phase behavior of the system, which in turn is accomplished in two stages: Phase stability test - to identify the existence of number of phase in a particular grid cell, and Flash calculation - to determine the split fraction of components amongst the phases present. The aforesaid procedure is referred as the standard EoS based approach to solve compositional problem and they are generally arduous. In previous works, a compositional-space parameterization approach was proposed to speed up the phase-behavior calculations by replacing the flash calculation with interpolations in the parameter space of the problem. The phase behavior of gas-injection processes is predominantly controlled by the properties of the two key tie-lines that extend through the initial and the injection compositions, and hence it is convenient to parameterize the problem based on these two tie-lines. It has also been proven that the projection of composition solution onto the full tie-line space is invariant to the hydrodynamic property of the compositional system. Here we utilize this technique to develop a multiscale reconstruction of compositional transport. Two types of prolongation operators are defined based on the local saturation history, with each having different computational complexities. In the first stage, a fine scale prolongation operator is implemented on a modified conservation equation with the objective of reconstructing the leading and trailing shock positions in space. Once the position of shocks are identified, the solution lying in the regions outside the shock can be solved on a coarse-scale mesh, since the structure of the transport solution outside of the two-phase region is relatively simple. Later, the fine scale projection of this coarse solution is carried out using the constant prolongation operator. The solution for nc components lying in between leading and trailing shocks is reconstructed by solving just two equations. The proposed reconstruction strategy results in coarsening of the compositional problem, both in…
Advisors/Committee Members: Voskov, Denis (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: reservoir simulation; composition; Nonlinear Equations; Numerical Mathematics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ganapathy, C. (. (2017). Multiscale Reconstruction of Compositional Transport. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:24de2b60-9c17-4f28-a086-91ee9178ebe7
Chicago Manual of Style (16th Edition):
Ganapathy, Chandru (author). “Multiscale Reconstruction of Compositional Transport.” 2017. Masters Thesis, Delft University of Technology. Accessed January 27, 2021.
http://resolver.tudelft.nl/uuid:24de2b60-9c17-4f28-a086-91ee9178ebe7.
MLA Handbook (7th Edition):
Ganapathy, Chandru (author). “Multiscale Reconstruction of Compositional Transport.” 2017. Web. 27 Jan 2021.
Vancouver:
Ganapathy C(. Multiscale Reconstruction of Compositional Transport. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Jan 27].
Available from: http://resolver.tudelft.nl/uuid:24de2b60-9c17-4f28-a086-91ee9178ebe7.
Council of Science Editors:
Ganapathy C(. Multiscale Reconstruction of Compositional Transport. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:24de2b60-9c17-4f28-a086-91ee9178ebe7
Cranfield University
29.
Lesmana, D.
An investigation into the effect of the gilding jacket on 12.7 mm armour-piercing projectile penetration of armour materials.
Degree: 2018, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/15261
► The influence of both the bullet jacket and projectile core hardness for 12.7-mm armour piercing (AP) rounds has been investigated using a variety of different…
(more)
▼ The influence of both the bullet jacket and projectile core hardness for 12.7-mm armour piercing (AP) rounds has been investigated using a variety of different experiments with the aim of optimising projectile performance. The research was designed to elucidate the role of these two elements in the penetration process, building on work elsewhere in the literature. A combination of forwards and reverse (target impacting stationary projectile) investigations provided insight into both penetration efficiency and resultant target failure modes. The results of these experiments, backed by a pressure-gauge based impact technique, were validated via numerical modelling.
It was observed that the jacket appears to serve three inter-linked functions: pre-damage of the target; cushioning of the AP core and confinement of the core. Modifying the core hardness showed that penetration efficiency was maximised when this hardness was greater than / overmatched that of the target (Armox Advance) plate. This behaviour was more pronounced when a thicker (9 rather than 5-mm thick) target plate was employed, suggesting that projectile / target interaction time was of particular importance (a potential confinement effect). However, for the 9-mm target plates where overmatch did not occur, reduced penetration / a ‘ceramic-like’ response was observed. In a similar manner, the presence of a jacket had the greatest effect for thicker plates. However, this confinement effect was complemented by pressure gauge results which suggested that the presence of the jacket enhanced energy coupling into the target (and, in corollary, that the jacket prevented premature and excessive loading of the core). In turn, numerical simulations provided further evidence that the jacket appeared to be protecting (cushioning) the core on impact. However, these also highlighted the extent of pre-damage caused by the jacket.
Subjects/Keywords: Reverse ballistics; Gas guns; Numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lesmana, D. (2018). An investigation into the effect of the gilding jacket on 12.7 mm armour-piercing projectile penetration of armour materials. (Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/15261
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lesmana, D. “An investigation into the effect of the gilding jacket on 12.7 mm armour-piercing projectile penetration of armour materials.” 2018. Thesis, Cranfield University. Accessed January 27, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/15261.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lesmana, D. “An investigation into the effect of the gilding jacket on 12.7 mm armour-piercing projectile penetration of armour materials.” 2018. Web. 27 Jan 2021.
Vancouver:
Lesmana D. An investigation into the effect of the gilding jacket on 12.7 mm armour-piercing projectile penetration of armour materials. [Internet] [Thesis]. Cranfield University; 2018. [cited 2021 Jan 27].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/15261.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lesmana D. An investigation into the effect of the gilding jacket on 12.7 mm armour-piercing projectile penetration of armour materials. [Thesis]. Cranfield University; 2018. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/15261
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
30.
Taylor, Brian D.
Instability of steady and quasi-steady detonations.
Degree: PhD, 0242, 2011, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/18646
► The stability properties and dynamic behavior of steady and quasi-steady detonation theories are investigated through linear stability analysis and numerical simulation. A general, unsteady, three-dimensional…
(more)
▼ The stability properties and dynamic behavior of steady and quasi-steady detonation theories are investigated through linear stability analysis and
numerical simulation.
A general, unsteady, three-dimensional formulation of the reactive Euler equations in a shock-fitted reference frame is derived.
The formulation is specialized to three configurations: planar one-dimensional detonation, radially symmetric one-dimensional detonation, and two-dimensional detonation in a rectangular channel.
High-order convergent
numerical simulation schemes for these configurations are derived and used to study the linear and nonlinear stability of detonations.
Shock-fitted
numerical simulation is used to study the two-dimensional instability of steady solutions to the Zel'dovich, von Neumann, and Doring (ZND) model of detonation.
It is demonstrated through several methods of analysis that the dependence of instability growth rates and oscillation frequencies on the initial disturbance wavelength, as predicted by linear stability theory, is quantitatively reproduced by shock-fitted simulations.
Agreement with the theorized temporal and spatial structure of the instability is demonstrated by a functional expansion of the solution perturbations, obtained from
simulation data, in terms of the linear stability eigenfunctions.
Three regimes of unstable behavior - linear, weakly non-linear, and fully non-linear - are explored and characterized in terms of the power spectrum of the normal detonation velocity.
Using solutions obtained from Detonation Shock Dynamics (DSD) theory, the behavior of cylindrically and spherically expanding symmetric detonations is studied by one-dimensional shock-fitted
numerical simulation.
We consider idealized models of gaseous and condensed phase detonation, as well as a realistic model calibrated for the high explosive PBX-9501.
We study the behavior of detonations initialized with solutions of DSD as they expand radially.
The various models and calibrations exhibit regimes of hydrodynamic stability, in which the detonation evolves slowly in time and agreement with DSD theory is good, and regimes of instability, which in some cases leads to failure of the detonation wave.
Advisors/Committee Members: Stewart, Scott (advisor), Stewart, Scott (Committee Chair), Matalon, Moshe (committee member), Austin, Joanna M. (committee member), Pantano-Rubino, Carlos A. (committee member).
Subjects/Keywords: Detonation; Shock-fitting; stability; numerical simulation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Taylor, B. D. (2011). Instability of steady and quasi-steady detonations. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18646
Chicago Manual of Style (16th Edition):
Taylor, Brian D. “Instability of steady and quasi-steady detonations.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 27, 2021.
http://hdl.handle.net/2142/18646.
MLA Handbook (7th Edition):
Taylor, Brian D. “Instability of steady and quasi-steady detonations.” 2011. Web. 27 Jan 2021.
Vancouver:
Taylor BD. Instability of steady and quasi-steady detonations. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/2142/18646.
Council of Science Editors:
Taylor BD. Instability of steady and quasi-steady detonations. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18646
◁ [1] [2] [3] [4] [5] … [72] ▶
. 
Open Access Theses and Dissertations
